1. Which frame field is created by a source node and used by a destination node to ensure that a transmitted data signal has not been altered by interference, distortion, or signal loss?
- transport layer error check field
- frame check sequence field
- User Datagram Protocol field
- error correction process field
- flow control field
Explanation: The frame check sequence (FCS) field is a critical part of the data link layer frame trailer used for error detection. During the encapsulation process, a source node performs a mathematical calculation known as a cyclic redundancy check (CRC) on the frame's contents and places the resulting value into the FCS field. The destination node performs the same calculation upon receiving the frame; if the results do not match the value in the FCS field, it indicates that the data has been altered during transmission. This alteration is often caused by external physical factors such as interference, distortion, or signal loss occurring on the network media. By identifying these discrepancies, the data link layer can reject and discard corrupt frames to ensure that only valid data is passed up to the higher layers of the protocol stack.
2. Which data link layer addressing scheme is used in a point-to-point logical topology?
- IPv4 addressing
- IPv6 addressing
- ring addressing
- multi-access addressing
- Layer 2 addressing not required for this topology
3. What do network hosts use data link layer addresses for?
- remote delivery
- local and remote delivery
- local delivery
- remote delivery using routers
4. Which three basic parts are common to all frame types supported by the data link layer? (Choose three.)
- header
- type field
- MTU size
- data
- trailer
- CRC value
Explanation: The data link protocol is responsible for NIC-to-NIC communications within the same network. Although there are many different data link layer protocols that describe data link layer frames, each frame type has three basic parts:
- Header
- Data
- Trailer
5. What are two characteristics of the controlled media access method? (Choose two.)
- It is known as a deterministic access method.
- There are no collisions when this type of method is in use.
- Any station can transmit at any time.
- Bandwidth is more efficiently utilized than in a contention-based access method.
- Stations must determine if the media is carrying a signal before they can transmit.
6. Which of the following are sublayers of the Data Link layer?
- ACL, LMC
- MAC, LAC
- MAC, LLC
- OSI, LLC
7. Which of the following are data link layer encapsulation details? (Choose two.)
- A header and trailer are added.
- Data is converted into packets.
- Packets are packaged into frames.
- Frames are divided into segments.
- Packets are changed into bits for Internet travel.
8. What is achieved by the encapsulation process at the data link layer?
- Packets are put into frames.
- Data is packaged into a packet.
- Packets are divided into segments.
- Data is converted for Internet transmission.
9. Drag the characteristics on the left to the associated media access control methods on the right. (Not all options are used.)
Answer
10. Drag the characteristics on the left to the associated topology type on the right. (Not all options are used.)
Answer
